338 NORTH AMERICAN DIPTERA 



Desmomyza, new genus 



Related to Hijpaspistomijia Hendel but differing in having the 

 pteropleiira entirely bare instead of having some setulae above. Geno- 

 type : — D. confusa n. sp. (New York). 



The genotype is extremely like H. glabra Fallen, of which I believe 

 Dcsmometopa haltemlis Coqiiillett to be a synonym. It is entirely 

 shining black except the base of the tarsi, the wings are milky white 

 with yellowish veins. The only difference between Desmomyza and 

 H}fpaspisto7ui/ia, to which I refer glabra, lies in the presence in the latter 

 of ptcropleural setules. The type of haUeraJis has these, as do European 

 specimens of glabra examined by me, hence my belief that Coquillett's 

 species is the same as glabra. The weaker frontals will separate 

 Desmomyza from Desmomcfopa. 



